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  <div class="section" id="s-django-1-5-5-release-notes">
<span id="django-1-5-5-release-notes"></span><h1>Django 1.5.5 release notes<a class="headerlink" href="#django-1-5-5-release-notes" title="永久链接至标题">¶</a></h1>
<p><em>October 23, 2013</em></p>
<p>Django 1.5.5 fixes a couple security-related bugs and several other bugs in the
1.5 series.</p>
<div class="section" id="s-readdressed-denial-of-service-via-password-hashers">
<span id="readdressed-denial-of-service-via-password-hashers"></span><h2>Readdressed denial-of-service via password hashers<a class="headerlink" href="#readdressed-denial-of-service-via-password-hashers" title="永久链接至标题">¶</a></h2>
<p>Django 1.5.4 imposes a 4096-byte limit on passwords in order to mitigate a
denial-of-service attack through submission of bogus but extremely large
passwords. In Django 1.5.5, we've reverted this change and instead improved
the speed of our PBKDF2 algorithm by not rehashing the key on every iteration.</p>
</div>
<div class="section" id="s-properly-rotate-csrf-token-on-login">
<span id="properly-rotate-csrf-token-on-login"></span><h2>Properly rotate CSRF token on login<a class="headerlink" href="#properly-rotate-csrf-token-on-login" title="永久链接至标题">¶</a></h2>
<p>This behavior introduced as a security hardening measure in Django 1.5.2 did
not work properly and is now fixed.</p>
</div>
<div class="section" id="s-bugfixes">
<span id="bugfixes"></span><h2>Bugfixes<a class="headerlink" href="#bugfixes" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li>Fixed a data corruption bug with <code class="docutils literal notranslate"><span class="pre">datetime_safe.datetime.combine</span></code> (#21256).</li>
<li>Fixed a Python 3 incompatibility in <code class="docutils literal notranslate"><span class="pre">django.utils.text.unescape_entities()</span></code>
(#21185).</li>
<li>Fixed a couple data corruption issues with <code class="docutils literal notranslate"><span class="pre">QuerySet</span></code> edge cases under
Oracle and MySQL (#21203, #21126).</li>
<li>Fixed crashes when using combinations of <code class="docutils literal notranslate"><span class="pre">annotate()</span></code>,
<code class="docutils literal notranslate"><span class="pre">select_related()</span></code>, and <code class="docutils literal notranslate"><span class="pre">only()</span></code> (#16436).</li>
</ul>
</div>
<div class="section" id="s-backwards-incompatible-changes">
<span id="backwards-incompatible-changes"></span><h2>Backwards incompatible changes<a class="headerlink" href="#backwards-incompatible-changes" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li>The undocumented <code class="docutils literal notranslate"><span class="pre">django.core.servers.basehttp.WSGIServerException</span></code> has
been removed. Use <code class="docutils literal notranslate"><span class="pre">socket.error</span></code> provided by the standard library instead.</li>
</ul>
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<li><a class="reference internal" href="#">Django 1.5.5 release notes</a><ul>
<li><a class="reference internal" href="#readdressed-denial-of-service-via-password-hashers">Readdressed denial-of-service via password hashers</a></li>
<li><a class="reference internal" href="#properly-rotate-csrf-token-on-login">Properly rotate CSRF token on login</a></li>
<li><a class="reference internal" href="#bugfixes">Bugfixes</a></li>
<li><a class="reference internal" href="#backwards-incompatible-changes">Backwards incompatible changes</a></li>
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